US20160220150A1 - Surgical instrument with magnetic sensor - Google Patents
Surgical instrument with magnetic sensor Download PDFInfo
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- US20160220150A1 US20160220150A1 US14/917,667 US201414917667A US2016220150A1 US 20160220150 A1 US20160220150 A1 US 20160220150A1 US 201414917667 A US201414917667 A US 201414917667A US 2016220150 A1 US2016220150 A1 US 2016220150A1
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- magnetic field
- tissue
- field sensor
- tissue contacting
- contacting surface
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/107—Measuring physical dimensions, e.g. size of the entire body or parts thereof
- A61B5/1076—Measuring physical dimensions, e.g. size of the entire body or parts thereof for measuring dimensions inside body cavities, e.g. using catheters
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/068—Surgical staplers, e.g. containing multiple staples or clamps
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/068—Surgical staplers, e.g. containing multiple staples or clamps
- A61B17/072—Surgical staplers, e.g. containing multiple staples or clamps for applying a row of staples in a single action, e.g. the staples being applied simultaneously
- A61B17/07207—Surgical staplers, e.g. containing multiple staples or clamps for applying a row of staples in a single action, e.g. the staples being applied simultaneously the staples being applied sequentially
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/10—Surgical instruments, devices or methods, e.g. tourniquets for applying or removing wound clamps, e.g. containing only one clamp or staple; Wound clamp magazines
- A61B17/105—Wound clamp magazines
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/11—Surgical instruments, devices or methods, e.g. tourniquets for performing anastomosis; Buttons for anastomosis
- A61B17/115—Staplers for performing anastomosis in a single operation
- A61B17/1155—Circular staplers comprising a plurality of staples
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/107—Measuring physical dimensions, e.g. size of the entire body or parts thereof
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6846—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive
- A61B5/6847—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive mounted on an invasive device
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00017—Electrical control of surgical instruments
- A61B2017/00022—Sensing or detecting at the treatment site
- A61B2017/00039—Electric or electromagnetic phenomena other than conductivity, e.g. capacity, inductivity, Hall effect
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00017—Electrical control of surgical instruments
- A61B2017/00115—Electrical control of surgical instruments with audible or visual output
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00017—Electrical control of surgical instruments
- A61B2017/00199—Electrical control of surgical instruments with a console, e.g. a control panel with a display
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/068—Surgical staplers, e.g. containing multiple staples or clamps
- A61B17/072—Surgical staplers, e.g. containing multiple staples or clamps for applying a row of staples in a single action, e.g. the staples being applied simultaneously
- A61B2017/07214—Stapler heads
- A61B2017/07257—Stapler heads characterised by its anvil
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/068—Surgical staplers, e.g. containing multiple staples or clamps
- A61B17/072—Surgical staplers, e.g. containing multiple staples or clamps for applying a row of staples in a single action, e.g. the staples being applied simultaneously
- A61B2017/07214—Stapler heads
- A61B2017/07271—Stapler heads characterised by its cartridge
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
- A61B90/06—Measuring instruments not otherwise provided for
- A61B2090/061—Measuring instruments not otherwise provided for for measuring dimensions, e.g. length
Definitions
- the present disclosure relates to a surgical instrument, and more particularly, to a surgical instrument including a magnetic field sensor assembly for determining tissue thickness.
- Various surgical procedures are performed in a minimally invasive manner. This includes forming a small opening through a body wall of a patient, e.g., in the abdomen, and inserting surgical instruments therethrough to perform surgical procedures. Due to the relatively small interior dimensions of the access devices used in endoscopic procedures, only elongated, small-diametered instrumentation may be used to access the internal body cavities and organs. Typically, such instruments are limited in their ability to sense and/or control conditions and/or parameters during an operation, such as, for example, the thickness of tissue positioned between tissue contacting surfaces of an end effector of the surgical instrument.
- a surgical instrument including an end effector, a magnetic field sensor assembly, and a processor.
- the end effector includes first and second tissue contacting surfaces configured to receive tissue therebetween.
- the first tissue contacting surface is movable relative to the second tissue contacting surface between a spaced apart position and an approximated position.
- the magnetic field sensor assembly includes a first magnetic field sensor disposed on the first tissue contacting surface and a first magnet disposed on the second tissue contacting surface.
- the first magnetic field sensor may be disposed on the second tissue contacting surface and the first magnet may be disposed on the first tissue contacting surface.
- the processor is connected to the first magnetic field sensor.
- the processor determines a distance between the first and second tissue contacting surfaces based on a detectable signal received from the first magnetic field sensor.
- the surgical instrument may further include a contact sensor disposed on the first tissue contacting surface.
- the contact sensor may monitor contact between tissue and the first tissue contacting surface during approximation of the first tissue contacting surface toward the second tissue contacting surface.
- the first tissue contacting surface may be pivotably coupled with the second tissue contacting surface about a pivot.
- the first magnetic field sensor may be disposed adjacent the pivot.
- the magnetic field sensor assembly may further include a second magnetic field sensor disposed distal of the first magnetic field sensor and a second magnet disposed distal of the first magnet, such that during approximation of the first tissue contacting surface toward the second tissue contacting surface, the first magnetic field sensor contacts tissue while the second magnetic field sensor is spaced apart from tissue.
- the first magnet and the first magnetic field sensor may be in a superposed relation in the approximated position.
- the first magnetic field sensor may be a Hall effect sensor.
- the first magnetic field sensor may include a magnetoresistive film.
- a method of determining tissue thickness includes placing tissue between a first tissue contacting surface and a second tissue contacting surface of an end effector of a surgical instrument; approximating the first and second tissue contacting surfaces; generating a detectable signal; and calculating a distance between the first and second tissue contacting surfaces based on the detectable signal.
- the detectable signal is generated by a magnetic field sensor on the first tissue contacting surface in response to a magnetic field of a magnet on the second tissue contacting surface.
- the method may further include determining an initial contact between tissue and the first tissue contacting surface. Furthermore, generating a detectable signal may include generating the detectable signal at the time of initial contact between tissue and the first tissue contacting surface.
- a method of determining tissue thickness includes placing a magnet on a first side of tissue; placing a magnetic field sensor mounted on a surgical instrument on a second side of tissue; generating a detectable signal; and calculating a distance between the magnet and the magnetic field sensor based on the detectable signal.
- the second side is opposite of the first side.
- the detectable signal is generated by the magnetic field sensor in response to a magnetic field of the magnet.
- FIG. 1 is a perspective view of a surgical instrument in accordance with an embodiment of the present disclosure
- FIG. 2 is a side, cross-sectional view of a main body of the surgical instrument of FIG. 1 , shown in a first, unapproximated condition;
- FIG. 3 is an enlarged, side cross-sectional view of a tool assembly of the surgical instrument of FIGS. 1 and 2 , shown in the first, unapproximated condition;
- FIG. 4 is an enlarged, side cross-sectional view of the tool assembly of the surgical instrument of FIGS. 1 and 2 , shown in a second, approximated condition;
- FIG. 5 in an enlarged, side cross-sectional view of the tool assembly of the surgical instrument of FIGS. 1 and 2 , shown after completion of a firing stroke;
- FIG. 6 is a perspective view of a surgical instrument in accordance with another embodiment of the present disclosure.
- FIG. 7 is a top perspective view of a handle assembly of the surgical instrument of FIG. 6 with a portion of a handle section removed therefrom;
- FIG. 8 is a side cross-sectional view of the distal end of the surgical instrument of FIGS. 6 and 7 , shown in a first condition;
- FIG. 9 is a side cross-sectional view of the distal end of the surgical instrument of FIGS. 6 and 7 , shown in a second condition;
- FIG. 10 is a perspective view of a surgical instrument in accordance with another embodiment of the present disclosure.
- FIG. 11 is a side, cross-sectional view of the surgical instrument of FIG. 10 ;
- FIG. 12 is a partial perspective view of a magnet assembly for use with the surgical instrument of FIG. 10 .
- distal as is conventional, will refer to that portion of the instrument, apparatus, device or component thereof which is farther from the user while, the term “proximal,” will refer to that portion of the instrument, apparatus, device or component thereof which is closer to the user.
- proximal will refer to that portion of the instrument, apparatus, device or component thereof which is closer to the user.
- Surgical instrument 300 including a magnetic field sensor assembly 3000 ( FIG. 2 ) in accordance with an embodiment of the present disclosure.
- Surgical instrument 300 includes a handle assembly 312 and an elongated body 314 .
- Handle assembly 312 includes a stationary handle member 326 , a movable handle or trigger 328 and a barrel portion 330 .
- a disposable loading unit or DLU 316 is releasably secured to a distal end of elongated body 314 .
- DLU 316 includes a proximal body portion 318 , which forms an extension of elongated body 314 , and a distal tool assembly or end effector 320 including a cartridge assembly 322 and an anvil assembly 324 .
- Tool assembly 320 is pivotably connected to body portion 318 about an axis substantially perpendicular to the longitudinal axis of elongated body 314 .
- U.S. Pat. No. 8,281,937 the entire contents of which are incorporated herein by reference, for a more detailed discussion of the structure and operation of surgical instrument 300 .
- surgical instrument 300 includes a magnetic field sensor assembly 3000 disposed in tool assembly 320 .
- Magnetic field sensor assembly 3000 includes a plurality of magnets 362 a, 362 b, 362 c, 362 d disposed on tissue contacting surface 322 a ( FIG. 3 ) of cartridge assembly 322 and a plurality of magnetic field sensors 360 a, 360 b, 360 c, 360 d disposed on tissue contacting surface 324 a ( FIG. 3 ) of anvil assembly 324 .
- Magnets 362 a, 362 b, 362 c, 362 d may be permanent magnets or electromagnets.
- Magnetic field sensors 360 a, 360 b, 360 c, 360 d may be any type of sensor capable of generating a detectable signal in response to the presence of a magnetic field.
- the magnitude of the detectable signal generated by the sensor varies with the strength of the magnetic field detected.
- Suitable magnetic field sensors include, e.g., Hall effect sensors.
- a Hall effect sensor is a transducer that varies its output voltage (the detectable signal) in response to a magnetic field.
- Magnetoresistive films may be used in making the magnetic field sensor.
- a magnetic field sensor made from thin film giant magnetoresistive (GMR) materials may be placed adjacent a source for producing a magnetic field.
- GMR giant magnetoresistive
- the GMR material and the source for producing the magnetic field may be placed on respective tissue contacting surfaces 322 a, 324 a of surgical instrument 300 . Accordingly, the distance from the GMR material to the source for producing the magnetic field would vary with changes in the thickness of tissue. The distance from the GMR material to the source for producing the magnetic field may be calculated based on the magnitude of the detectable signal generated by the GMR material based on the strength of the magnetic field at any given time.
- Magnetic field sensors 360 a, 360 b, 360 c, 360 d are pre-calibrated for magnets 362 a, 362 b, 362 c, 362 d.
- magnets 362 a, 362 b, 362 c, 362 d For any particular magnet 362 a, 362 b, 362 c, 362 d and orientation of sensor 360 a, 360 b, 360 c, 360 d with respect to that magnet, distance between sensor 360 a, 360 b , 360 c, 360 d and the respective magnets 362 a, 362 b, 362 c, 362 d can be determined by means of interpolation of pre-calibrated values.
- a sensor reading proportional to the magnetic field is transformed to a distance measurement by means of interpolation or lookup table in which each value of the magnetic field measurement is converted to the thickness of tissue.
- ⁇ 0 permeability of free space and ⁇ m is a magnetic susceptibility of material.
- magnetic susceptibility is extremely small ⁇ m ⁇ 1) (e.g., ⁇ m of water is ⁇ 9.035 ⁇ 10 ⁇ 6 ).
- Human tissue and other nonferrous and ferrimagnetic materials do not differ substantially from that of free space in terms of magnetic field propagation.
- the permeabilities of diamagnetic and paramagnetic materials do not differ substantially from that of free space and these materials being inserted between magnet and magnetometer substantially have no effect on distance measurements.
- magnets 362 a, 362 b, 362 c, 362 d and corresponding magnetic field sensors 360 a, 360 b, 360 c, 360 d are positioned on respective tissue contacting surfaces 322 a, 324 a, such that a magnet 362 a, 362 b, 362 c, 362 d and a corresponding magnetic field sensor 360 a, 360 b, 360 c, 360 d form a pair and are in a superposed relation when anvil assembly 324 is in the approximated position ( FIG. 4 ) to clamp tissue “T” between tissue contacting surfaces 322 a, 324 a.
- Sensors 360 a, 360 b, 360 c, 360 d may be selectively connected to a processor or a central processing unit (CPU) ( FIG. 1 ) for monitoring, controlling, processing and/or storing information observed, measured, sensed and/or transmitted from any of the elements of components of the surgical instruments prior, during and/or after the surgical procedure.
- Sensors 360 a, 360 b, 360 c, 360 d may be electrically connected via a wire 7 ( FIG. 3 ) or connected wirelessly to CPU.
- the data collected by sensors 360 a, 360 b, 360 c, 360 d are sent to CPU.
- the data are transformed to a distance measurement by means of interpolation in which each value of magnetic field measurement is converted to a tissue thickness.
- the tissue thickness may be displayed on an indicator (not shown) in units of length (thickness) or, alternatively, graphically represented for potential use of the device in any particular case, e.g., whether the device is appropriately sized for the procedure. It is contemplated that the display may be the monitor to which images are shown from the camera used during laparoscopic surgery. It is also contemplated that the display may be on the instrument itself, for example, on barrel portion 330 of surgical instrument 300 , or any other portion of surgical instrument 300 that is easily viewed by the user during surgery.
- Tool assembly 320 may further include contact sensors 77 a, 79 a connected to CPU to detect an initial contact between tissue “T” and tissue contacting surface 324 a of anvil assembly 324 .
- contact sensors 77 a, 79 a may include pressure sensors, electrical contacts and sensing circuits, force transducers, piezoelectric elements, piezoresistive elements, metal film strain gauges, semiconductor strain gauges, inductive pressure sensors, capacitive pressure sensors, and potentiometric pressure transducers.
- Contact sensors 77 a, 79 a may be disposed adjacent sensor 360 a and magnet 362 a , respectively.
- contact sensors 77 a detect an initial contact between tissue contacting surface 324 a and tissue “T” during approximation of anvil assembly 324 .
- magnetic field sensor 360 a can measure tissue thickness when tissue “T” is initially brought into contact with tissue contacting surface 324 a of anvil assembly 324 , which, in turn, enables the surgeon to measure the substantially uncompressed thickness of tissue “T”.
- contact sensors 77 a, 79 a may provide the user with an indication (e.g., audio, visual, tactile, etc.) as to when tissue “T” is initially brought into contact with tissue contacting surface 324 a of anvil assembly 324 .
- an indication e.g., audio, visual, tactile, etc.
- target tissue “T” is placed therebetween. With the target tissue “T” positioned between cartridge assembly 322 and anvil assembly 324 , anvil assembly 324 is approximated toward cartridge assembly 322 .
- Contact sensor 77 a, 79 a may detect the initial contact between tissue “T” and tissue contacting surface 324 a.
- magnetic field sensor 360 a may measure the magnetic field and send the data to CPU, which determines the substantially uncompressed thickness of tissue “T”. The tissue thickness in the uncompressed state is measured and/or recorded.
- cartridge assembly 322 and anvil assembly 324 are further approximated until all sensors 360 a, 360 b, 360 c, 360 d are in a superposed relation with the respective magnets 362 a, 362 b, 362 c, 362 d. Then, the tissue thickness in the compressed state is measured and/or recorded.
- anvil assembly 324 is movable in relation to cartridge assembly 322 between an open position ( FIG. 3 ) spaced from cartridge assembly 322 and an approximated or clamped position ( FIG. 4 ) in juxtaposed alignment with cartridge assembly 322 .
- movable handle 328 is moved toward stationary handle 326 , through an actuation stroke. Subsequent movement of movable handle 328 through the actuation stroke effects advancement of an actuation shaft and a firing rod (not shown). As the actuation shaft is advanced, the firing rod is also advanced.
- the firing rod is connected at its distal end to axial drive assembly 312 a ( FIG. 4 ) such that advancement of the firing rod effects advancement of drive assembly 312 a.
- drive assembly 312 a As drive assembly 312 a is advanced, cam roller 386 moves into engagement with cam surface 309 of anvil assembly 324 to urge anvil assembly 324 toward cartridge assembly 322 , thereby approximating cartridge and anvil assemblies 322 and 324 and clamping tissue “T” therebetween.
- movable handle 328 is moved through a second actuation stroke to further advance the actuation shaft and the firing rod distally.
- drive assembly 312 a ( FIG. 4 ) is advanced distally to advance actuation sled 334 through staple cartridge assembly 322 to simultaneously sever tissue “T” with knife 380 and drive pushers 348 to sequentially eject staples “S” from cartridge assembly 322 .
- Surgical instrument 300 is adapted to receive DLU's having staple cartridges with staples in linear rows having a length of from about 30 mm to about 60 mm.
- each actuation stroke of movable handle 328 during firing of surgical instrument 300 may advance the actuation shaft approximately 15 mm, although other lengths are envisioned.
- movable handle 328 in embodiments to fire a cartridge assembly having a 45 mm row of staples, movable handle 328 must be moved through three actuation strokes after the approximating or clamping stroke of movable handle 328 .
- Surgical instrument 100 includes a proximal handle assembly 112 , an elongated central body portion 114 including a curved elongated outer tube 114 a, and a distal head portion 116 .
- proximal handle assembly 112 an elongated central body portion 114 including a curved elongated outer tube 114 a
- distal head portion 116 a distal head portion 116 .
- the length, shape and/or the diameter of body portion 114 and head portion 116 may also be tailored to a particular surgical procedure being performed.
- handle assembly 112 includes a stationary handle 118 , a firing trigger 120 , a rotatable approximation knob 122 and an indicator 124 .
- Head portion 116 includes an anvil assembly 130 and a shell assembly 131 .
- magnetic field sensor assembly 1000 includes a plurality of magnets 162 disposed on tissue contacting surface 131 a of shell assembly 131 and a plurality of magnetic field sensors 160 disposed on tissue contacting surface 130 a of anvil assembly 130 .
- Magnets 162 and magnetic field sensors 160 may be constructed as described above in connection with the embodiments of FIGS. 1 to 5 .
- magnets 162 and corresponding magnetic field sensors 160 are positioned on respective tissue contacting surfaces 130 a, 131 a such that a magnet 162 and a corresponding magnetic field sensor 160 form a pair and are in a superposed relation when anvil assembly 130 is in the approximated position ( FIG. 9 ) to clamp tissue “T 1 ”, “T 2 ” between tissue contacting surfaces 130 a, 131 a.
- the magnetic field reading or detectable signal from magnetic field sensors 160 is sent to a processor (CPU) ( FIG. 6 ).
- the data are transformed to a distance measurement by means of interpolation in which the value of the magnetic field measurement is translated to a tissue thickness.
- the tissue thickness can be displayed in any suitable manner, such as, for example, on indicator 124 ( FIG. 6 ) in units of length (thickness) or, alternatively, graphically represented for potential use of the device in any particular case, e.g., whether device caliber is appropriate for certain procedure.
- Head portion 116 may further include contact sensors 177 , 179 connected to CPU to provide indication as to when tissue interposed between anvil assembly 130 and shell assembly 131 is initially brought into contact with tissue contacting surface 130 a.
- a substantially uncompressed thickness of tissue may be measured by monitoring magnetic field sensor 160 when tissue is initially brought into contact with tissue contacting surface 130 a.
- the approximation mechanism includes approximation knob 122 , a drive screw 132 , a rotatable sleeve 170 , and an anvil retainer 138 ( FIG. 8 ) for supporting an anvil assembly 130 .
- Rotatable sleeve 170 includes a substantially cylindrical hollow body portion and a substantially cylindrical collar 142 which together define a central bore.
- Collar 142 has an annular groove 144 formed thereabout, which is dimensioned to receive an inwardly extending flange formed on an inner wall of handle assembly 118 .
- Approximation knob 122 includes a pair of internal slots (not shown) positioned to receive ribs 148 of sleeve 170 to rotatably fix sleeve 170 to knob 122 , such that rotation of knob 122 causes concomitant rotation of sleeve 170 .
- the proximal half of screw 132 includes a helical channel 150 and is dimensioned to be slidably positioned within the central bore of rotatable sleeve 170 . Since sleeve 170 is axially fixed with respect to handle assembly 118 , rotation of sleeve 170 about screw 132 causes a pin (not shown) to move along channel 150 of screw 132 to effect axial movement of screw 132 within handle assembly 118 .
- rotatable sleeve 170 is rotated about the proximal end of screw 132 to move a pin along helical channel 150 of screw 132 . Since sleeve 170 is axially fixed to handle assembly 118 , as the pin is moved through channel 150 , screw 132 is advanced or retracted within handle assembly 118 . As a result, top and bottom screw extensions (not shown), which are fastened to the distal end of screw 132 and to anvil retainer 138 , are moved axially within elongated body portion 114 . Since anvil assembly 130 is secured to the distal end of anvil retainer 138 , rotation of approximation knob 122 will effect movement of anvil assembly 130 in relation to shell assembly 131 between spaced and approximated positions.
- shell assembly 131 and anvil assembly 130 With shell assembly 131 and anvil assembly 130 in spaced relation to one another, target tissue is placed therebetween. With the target tissue positioned between shell assembly 131 and anvil assembly 130 , anvil assembly 130 is approximated towards shell assembly 131 until the target tissue makes a contact with contact sensors 177 , 179 . At this time, magnetic field sensors 160 may measure the magnetic field and send the data to CPU, which determines the thickness of substantially uncompressed tissue. The tissue thickness in the uncompressed state is displayed and/or recorded. Thereafter, shell assembly 131 and anvil assembly 130 are further approximated until a desired gap between shell assembly 131 and anvil assembly 130 is obtained. A compressed tissue thickness may be measured by magnetic field sensors 160 , during or after approximation of shell assembly 131 and anvil assembly 130 .
- first and second tissue “T 1 , T 2 ” are extended toward one another and are tensioned.
- first and second tissue “T 1 , T 2 ” tend to constrict around anvil assembly 130 and shell assembly 131 , respectively. This constriction exerts a force on each respective force measuring sensor 164 , 166 .
- Surgical instrument 100 may include a gauge 140 ( FIG. 6 ) supported on stationary handle 118 of handle assembly 112 . Each sensor 160 may be operatively connected to gauge 140 . Gauge 140 functions to display, in real time, selected operational parameters, such as, for example, tissue contact, tissue compression, tissue tension, etc.
- first and second tissues “T 1 , T 2 ” may be monitored to maintain the tension exerted thereon at or below a predetermined threshold level. For example, if the tension exerted on each tissue “T 1 , T 2 ”, either alone or in combination, exceeds a predetermined threshold level, elevated tension acts on the staple line and may result in undue strains exerted on the staples and/or the staple line.
- Surgical instrument 500 is configured to serially deploy at least one surgical anchor 510 to attach a prosthesis in place in the repair of a defect in tissue such as an inguinal hernia.
- Surgical instrument 500 includes a handle assembly 520 and a delivery tube 530 extending distally from handle assembly 520 .
- Handle assembly 520 includes a stationary handle 521 and a firing trigger 522 .
- magnetic field sensor 560 is disposed at a distal portion of delivery tube 530 .
- the placement of magnetic field sensor 560 at, e.g., a distal-most portion of delivery tube 530 facilitates use thereof in conjunction with a magnet assembly 600 .
- Magnet assembly 600 includes a magnet 605 and an elongated support 607 extending from magnet 605 .
- Magnet 605 and magnetic field sensor 560 may be constructed as described above in connection with embodiments of FIGS. 1-9 .
- Magnet 605 may be positioned on one side of tissue to be measured and magnetic field sensor 560 may be placed on an opposing side of tissue. Magnetic field sensor 560 generates a detectable signal in response to a magnetic field of magnet 605 . Magnetic field sensor 560 may be connected to a processor (not shown). The processor may calculate the distance between magnet 605 and magnetic field sensor 560 , i.e., thickness of tissue, based on the detectable signal.
- the surgeon may then apply surgical anchor 510 to tissue by pulling trigger 522 toward stationary handle 521 .
- a lever 524 rotates counterclockwise such that a cam surface 531 of lever 524 contacts a piston 525 which drives an anchor carrier rod 526 distally.
- a torsion spring 527 is compressed as lever 524 is rotated counterclockwise.
- Anchor carrier 526 is urged distally within a queuing spring 528 , which, in turn, urges the distal-most anchor 510 past a distal end of delivery tube 530 . In this manner, anchor 510 penetrates through the prosthesis and tissue.
- the plurality of magnets 162 may be disposed on tissue contacting surface 130 a of anvil assembly 130
- the plurality of magnetic field sensors 160 may be disposed on tissue contacting surface 131 a of shell assembly 131 .
- magnet 605 may be placed on a distal portion of delivery tube 530
- magnetic field sensor 560 may be provided as a separate element from surgical instrument 500 .
Abstract
Description
- This application is a U.S. National Stage Application filed under 35 U.S.C. §371(a) of International Patent Application No. PCT/US2014/050825, filed Aug. 13, 2014, which claims benefit of, and priority to, U.S. Provisional Patent Application 61/882,323, filed on Sep. 25, 2013. The entire contents of each of the above applications is hereby incorporated by reference.
- 1. Technical Field
- The present disclosure relates to a surgical instrument, and more particularly, to a surgical instrument including a magnetic field sensor assembly for determining tissue thickness.
- 2. Background of Related Art
- Various surgical procedures are performed in a minimally invasive manner. This includes forming a small opening through a body wall of a patient, e.g., in the abdomen, and inserting surgical instruments therethrough to perform surgical procedures. Due to the relatively small interior dimensions of the access devices used in endoscopic procedures, only elongated, small-diametered instrumentation may be used to access the internal body cavities and organs. Typically, such instruments are limited in their ability to sense and/or control conditions and/or parameters during an operation, such as, for example, the thickness of tissue positioned between tissue contacting surfaces of an end effector of the surgical instrument.
- Accordingly, a need exists for surgical instruments that can sense the amount of tissue positioned between tissue contacting surfaces of an end effector of the surgical instrument and provide this information to the user prior to operation of the surgical instrument.
- In accordance with an embodiment of the present disclosure, there is provided a surgical instrument including an end effector, a magnetic field sensor assembly, and a processor. The end effector includes first and second tissue contacting surfaces configured to receive tissue therebetween. The first tissue contacting surface is movable relative to the second tissue contacting surface between a spaced apart position and an approximated position. The magnetic field sensor assembly includes a first magnetic field sensor disposed on the first tissue contacting surface and a first magnet disposed on the second tissue contacting surface. Alternatively, the first magnetic field sensor may be disposed on the second tissue contacting surface and the first magnet may be disposed on the first tissue contacting surface. The processor is connected to the first magnetic field sensor. The processor determines a distance between the first and second tissue contacting surfaces based on a detectable signal received from the first magnetic field sensor.
- In an embodiment, the surgical instrument may further include a contact sensor disposed on the first tissue contacting surface. The contact sensor may monitor contact between tissue and the first tissue contacting surface during approximation of the first tissue contacting surface toward the second tissue contacting surface.
- In another embodiment, the first tissue contacting surface may be pivotably coupled with the second tissue contacting surface about a pivot. In particular, the first magnetic field sensor may be disposed adjacent the pivot. The magnetic field sensor assembly may further include a second magnetic field sensor disposed distal of the first magnetic field sensor and a second magnet disposed distal of the first magnet, such that during approximation of the first tissue contacting surface toward the second tissue contacting surface, the first magnetic field sensor contacts tissue while the second magnetic field sensor is spaced apart from tissue.
- In an embodiment, the first magnet and the first magnetic field sensor may be in a superposed relation in the approximated position. The first magnetic field sensor may be a Hall effect sensor. Alternatively, the first magnetic field sensor may include a magnetoresistive film.
- In accordance with another aspect of the present disclosure, there is provided a method of determining tissue thickness. The method includes placing tissue between a first tissue contacting surface and a second tissue contacting surface of an end effector of a surgical instrument; approximating the first and second tissue contacting surfaces; generating a detectable signal; and calculating a distance between the first and second tissue contacting surfaces based on the detectable signal. The detectable signal is generated by a magnetic field sensor on the first tissue contacting surface in response to a magnetic field of a magnet on the second tissue contacting surface.
- In an embodiment, the method may further include determining an initial contact between tissue and the first tissue contacting surface. Furthermore, generating a detectable signal may include generating the detectable signal at the time of initial contact between tissue and the first tissue contacting surface.
- In accordance with another embodiment of the present disclosure, there is provided a method of determining tissue thickness. The method includes placing a magnet on a first side of tissue; placing a magnetic field sensor mounted on a surgical instrument on a second side of tissue; generating a detectable signal; and calculating a distance between the magnet and the magnetic field sensor based on the detectable signal. The second side is opposite of the first side. The detectable signal is generated by the magnetic field sensor in response to a magnetic field of the magnet.
- Various embodiments of the present disclosure are described hereinbelow with reference to the drawings, wherein:
-
FIG. 1 is a perspective view of a surgical instrument in accordance with an embodiment of the present disclosure; -
FIG. 2 is a side, cross-sectional view of a main body of the surgical instrument ofFIG. 1 , shown in a first, unapproximated condition; -
FIG. 3 is an enlarged, side cross-sectional view of a tool assembly of the surgical instrument ofFIGS. 1 and 2 , shown in the first, unapproximated condition; -
FIG. 4 is an enlarged, side cross-sectional view of the tool assembly of the surgical instrument ofFIGS. 1 and 2 , shown in a second, approximated condition; -
FIG. 5 in an enlarged, side cross-sectional view of the tool assembly of the surgical instrument ofFIGS. 1 and 2 , shown after completion of a firing stroke; -
FIG. 6 is a perspective view of a surgical instrument in accordance with another embodiment of the present disclosure; -
FIG. 7 is a top perspective view of a handle assembly of the surgical instrument ofFIG. 6 with a portion of a handle section removed therefrom; -
FIG. 8 is a side cross-sectional view of the distal end of the surgical instrument ofFIGS. 6 and 7 , shown in a first condition; -
FIG. 9 is a side cross-sectional view of the distal end of the surgical instrument ofFIGS. 6 and 7 , shown in a second condition; -
FIG. 10 is a perspective view of a surgical instrument in accordance with another embodiment of the present disclosure; -
FIG. 11 is a side, cross-sectional view of the surgical instrument ofFIG. 10 ; and -
FIG. 12 is a partial perspective view of a magnet assembly for use with the surgical instrument ofFIG. 10 . - Embodiments of the present disclosure will now be described in detail with reference to the drawings, in which like reference numerals designate identical or corresponding elements in each of the several views. As used herein, the term “distal,” as is conventional, will refer to that portion of the instrument, apparatus, device or component thereof which is farther from the user while, the term “proximal,” will refer to that portion of the instrument, apparatus, device or component thereof which is closer to the user. In the following description, well-known functions or constructions are not described in detail to avoid obscuring the present disclosure in unnecessary detail.
- With reference now to
FIGS. 1 and 2 , there is illustrated asurgical instrument 300 including a magnetic field sensor assembly 3000 (FIG. 2 ) in accordance with an embodiment of the present disclosure.Surgical instrument 300 includes ahandle assembly 312 and anelongated body 314.Handle assembly 312 includes astationary handle member 326, a movable handle or trigger 328 and abarrel portion 330. A disposable loading unit orDLU 316 is releasably secured to a distal end ofelongated body 314. DLU 316 includes aproximal body portion 318, which forms an extension ofelongated body 314, and a distal tool assembly orend effector 320 including acartridge assembly 322 and ananvil assembly 324.Tool assembly 320 is pivotably connected tobody portion 318 about an axis substantially perpendicular to the longitudinal axis ofelongated body 314. Reference may be made to U.S. Pat. No. 8,281,937, the entire contents of which are incorporated herein by reference, for a more detailed discussion of the structure and operation ofsurgical instrument 300. - With particular reference now to
FIGS. 2-4 ,surgical instrument 300 includes a magneticfield sensor assembly 3000 disposed intool assembly 320. Magneticfield sensor assembly 3000 includes a plurality ofmagnets tissue contacting surface 322 a (FIG. 3 ) ofcartridge assembly 322 and a plurality ofmagnetic field sensors tissue contacting surface 324 a (FIG. 3 ) ofanvil assembly 324.Magnets -
Magnetic field sensors tissue contacting surfaces surgical instrument 300. Accordingly, the distance from the GMR material to the source for producing the magnetic field would vary with changes in the thickness of tissue. The distance from the GMR material to the source for producing the magnetic field may be calculated based on the magnitude of the detectable signal generated by the GMR material based on the strength of the magnetic field at any given time. -
Magnetic field sensors magnets particular magnet sensor sensor respective magnets - Magnetic permeability of the material is given by the equation
-
μ=μ0(1+χm) (Eq. 1) - where μ0 is permeability of free space and χm is a magnetic susceptibility of material. For diamagnetic and paramagnetic materials, magnetic susceptibility is extremely small χm<<1) (e.g., χm of water is −9.035×10−6). Human tissue and other nonferrous and ferrimagnetic materials do not differ substantially from that of free space in terms of magnetic field propagation. As such, the permeabilities of diamagnetic and paramagnetic materials do not differ substantially from that of free space and these materials being inserted between magnet and magnetometer substantially have no effect on distance measurements.
- With particular reference now to
FIGS. 3 and 4 ,magnets magnetic field sensors tissue contacting surfaces magnet magnetic field sensor anvil assembly 324 is in the approximated position (FIG. 4 ) to clamp tissue “T” betweentissue contacting surfaces -
Sensors FIG. 1 ) for monitoring, controlling, processing and/or storing information observed, measured, sensed and/or transmitted from any of the elements of components of the surgical instruments prior, during and/or after the surgical procedure.Sensors FIG. 3 ) or connected wirelessly to CPU. The data collected bysensors barrel portion 330 ofsurgical instrument 300, or any other portion ofsurgical instrument 300 that is easily viewed by the user during surgery. -
Tool assembly 320 may further includecontact sensors tissue contacting surface 324 a ofanvil assembly 324. For example,contact sensors -
Contact sensors adjacent sensor 360 a andmagnet 362 a, respectively. In particular,contact sensors 77 a detect an initial contact betweentissue contacting surface 324 a and tissue “T” during approximation ofanvil assembly 324. In this manner,magnetic field sensor 360 a can measure tissue thickness when tissue “T” is initially brought into contact withtissue contacting surface 324 a ofanvil assembly 324, which, in turn, enables the surgeon to measure the substantially uncompressed thickness of tissue “T”. Assurgical instrument 300 is being clamped onto tissue “T”,contact sensors tissue contacting surface 324 a ofanvil assembly 324. - In use, with
cartridge assembly 322 andanvil assembly 324 in spaced relation to one another, target tissue “T” is placed therebetween. With the target tissue “T” positioned betweencartridge assembly 322 andanvil assembly 324,anvil assembly 324 is approximated towardcartridge assembly 322.Contact sensor tissue contacting surface 324 a. At this time,magnetic field sensor 360 a may measure the magnetic field and send the data to CPU, which determines the substantially uncompressed thickness of tissue “T”. The tissue thickness in the uncompressed state is measured and/or recorded. Thereafter,cartridge assembly 322 andanvil assembly 324 are further approximated until allsensors respective magnets - With reference to
FIGS. 1 and 5 ,anvil assembly 324 is movable in relation tocartridge assembly 322 between an open position (FIG. 3 ) spaced fromcartridge assembly 322 and an approximated or clamped position (FIG. 4 ) in juxtaposed alignment withcartridge assembly 322. To approximate cartridge andanvil assemblies movable handle 328 is moved towardstationary handle 326, through an actuation stroke. Subsequent movement ofmovable handle 328 through the actuation stroke effects advancement of an actuation shaft and a firing rod (not shown). As the actuation shaft is advanced, the firing rod is also advanced. - The firing rod is connected at its distal end to
axial drive assembly 312 a (FIG. 4 ) such that advancement of the firing rod effects advancement ofdrive assembly 312 a. Asdrive assembly 312 a is advanced,cam roller 386 moves into engagement withcam surface 309 ofanvil assembly 324 to urgeanvil assembly 324 towardcartridge assembly 322, thereby approximating cartridge andanvil assemblies - To fire
surgical instrument 300,movable handle 328 is moved through a second actuation stroke to further advance the actuation shaft and the firing rod distally. As the firing rod is advanced distally, drive assembly 312 a (FIG. 4 ) is advanced distally to advanceactuation sled 334 throughstaple cartridge assembly 322 to simultaneously sever tissue “T” withknife 380 and drivepushers 348 to sequentially eject staples “S” fromcartridge assembly 322. -
Surgical instrument 300 is adapted to receive DLU's having staple cartridges with staples in linear rows having a length of from about 30 mm to about 60 mm. For example, each actuation stroke ofmovable handle 328 during firing ofsurgical instrument 300 may advance the actuation shaft approximately 15 mm, although other lengths are envisioned. Accordingly, in embodiments to fire a cartridge assembly having a 45 mm row of staples,movable handle 328 must be moved through three actuation strokes after the approximating or clamping stroke ofmovable handle 328. - With reference now to
FIGS. 6 through 9 , a surgical instrument including a magnetic field sensor assembly 1000 (FIG. 8 ) in accordance with another embodiment of the present disclosure is generally designated as 100.Surgical instrument 100 includes aproximal handle assembly 112, an elongatedcentral body portion 114 including a curved elongatedouter tube 114 a, and adistal head portion 116. Alternately, in some surgical procedures, e.g., the treatment of hemorrhoids, it is desirable to have a substantially straight, preferably shortened, central body portion. The length, shape and/or the diameter ofbody portion 114 andhead portion 116 may also be tailored to a particular surgical procedure being performed. - With continued reference to
FIG. 6 , handleassembly 112 includes astationary handle 118, a firingtrigger 120, arotatable approximation knob 122 and anindicator 124.Head portion 116 includes ananvil assembly 130 and ashell assembly 131. Reference may be made to U.S. Pat. No. 7,802,712, the entire contents of which are incorporated herein by reference, for a more detailed discussion of the structure and operation ofsurgical instrument 100. - With additional reference to
FIGS. 6, 8, and 9 , magneticfield sensor assembly 1000 includes a plurality ofmagnets 162 disposed ontissue contacting surface 131 a ofshell assembly 131 and a plurality ofmagnetic field sensors 160 disposed ontissue contacting surface 130 a ofanvil assembly 130.Magnets 162 andmagnetic field sensors 160 may be constructed as described above in connection with the embodiments ofFIGS. 1 to 5 . - With continued reference to
FIGS. 8 and 9 ,magnets 162 and correspondingmagnetic field sensors 160 are positioned on respectivetissue contacting surfaces magnet 162 and a correspondingmagnetic field sensor 160 form a pair and are in a superposed relation whenanvil assembly 130 is in the approximated position (FIG. 9 ) to clamp tissue “T1”, “T2” betweentissue contacting surfaces magnetic field sensors 160 is sent to a processor (CPU) (FIG. 6 ). The data are transformed to a distance measurement by means of interpolation in which the value of the magnetic field measurement is translated to a tissue thickness. The tissue thickness can be displayed in any suitable manner, such as, for example, on indicator 124 (FIG. 6 ) in units of length (thickness) or, alternatively, graphically represented for potential use of the device in any particular case, e.g., whether device caliber is appropriate for certain procedure. -
Head portion 116 may further includecontact sensors anvil assembly 130 andshell assembly 131 is initially brought into contact withtissue contacting surface 130 a. Thus, a substantially uncompressed thickness of tissue may be measured by monitoringmagnetic field sensor 160 when tissue is initially brought into contact withtissue contacting surface 130 a. - With reference now to
FIGS. 7 and 8 , the approximation mechanism includesapproximation knob 122, adrive screw 132, arotatable sleeve 170, and an anvil retainer 138 (FIG. 8 ) for supporting ananvil assembly 130.Rotatable sleeve 170 includes a substantially cylindrical hollow body portion and a substantiallycylindrical collar 142 which together define a central bore.Collar 142 has anannular groove 144 formed thereabout, which is dimensioned to receive an inwardly extending flange formed on an inner wall ofhandle assembly 118. Engagement betweengroove 144 and the flanges axially fixessleeve 170 withinhandle assembly 118 while permitting rotation ofsleeve 170 in relation to handleassembly 118. A pair of diametrically opposedelongated ribs 148 is positioned or formed on the outer surface of the body portion.Approximation knob 122 includes a pair of internal slots (not shown) positioned to receiveribs 148 ofsleeve 170 torotatably fix sleeve 170 toknob 122, such that rotation ofknob 122 causes concomitant rotation ofsleeve 170. - The proximal half of
screw 132 includes ahelical channel 150 and is dimensioned to be slidably positioned within the central bore ofrotatable sleeve 170. Sincesleeve 170 is axially fixed with respect to handleassembly 118, rotation ofsleeve 170 aboutscrew 132 causes a pin (not shown) to move alongchannel 150 ofscrew 132 to effect axial movement ofscrew 132 withinhandle assembly 118. - In use, when
approximation knob 122 is manually rotated,rotatable sleeve 170 is rotated about the proximal end ofscrew 132 to move a pin alonghelical channel 150 ofscrew 132. Sincesleeve 170 is axially fixed to handleassembly 118, as the pin is moved throughchannel 150,screw 132 is advanced or retracted withinhandle assembly 118. As a result, top and bottom screw extensions (not shown), which are fastened to the distal end ofscrew 132 and toanvil retainer 138, are moved axially withinelongated body portion 114. Sinceanvil assembly 130 is secured to the distal end ofanvil retainer 138, rotation ofapproximation knob 122 will effect movement ofanvil assembly 130 in relation toshell assembly 131 between spaced and approximated positions. - With
shell assembly 131 andanvil assembly 130 in spaced relation to one another, target tissue is placed therebetween. With the target tissue positioned betweenshell assembly 131 andanvil assembly 130,anvil assembly 130 is approximated towardsshell assembly 131 until the target tissue makes a contact withcontact sensors magnetic field sensors 160 may measure the magnetic field and send the data to CPU, which determines the thickness of substantially uncompressed tissue. The tissue thickness in the uncompressed state is displayed and/or recorded. Thereafter,shell assembly 131 andanvil assembly 130 are further approximated until a desired gap betweenshell assembly 131 andanvil assembly 130 is obtained. A compressed tissue thickness may be measured bymagnetic field sensors 160, during or after approximation ofshell assembly 131 andanvil assembly 130. - In operation, following purse string suturing of a first tissue “T1” to
anvil assembly 130 and purse string suturing of a second tissue “T2” to shell assembly 131 (FIG. 8 ),approximation knob 122 is rotated toapproximate anvil assembly 130 towardsshell assembly 131. Asanvil assembly 130 andshell assembly 131 are approximated toward one another, first and second tissue “T1, T2” are extended toward one another and are tensioned. As first and second tissue “T1, T2” are tensioned, first and second tissue “T1, T2” tend to constrict aroundanvil assembly 130 andshell assembly 131, respectively. This constriction exerts a force on each respectiveforce measuring sensor force measuring sensor Surgical instrument 100 may include a gauge 140 (FIG. 6 ) supported onstationary handle 118 ofhandle assembly 112. Eachsensor 160 may be operatively connected to gauge 140. Gauge 140 functions to display, in real time, selected operational parameters, such as, for example, tissue contact, tissue compression, tissue tension, etc. - During a surgical anastomotic procedure, the tension on first and second tissues “T1, T2” may be monitored to maintain the tension exerted thereon at or below a predetermined threshold level. For example, if the tension exerted on each tissue “T1, T2”, either alone or in combination, exceeds a predetermined threshold level, elevated tension acts on the staple line and may result in undue strains exerted on the staples and/or the staple line.
- With reference now to
FIGS. 10 and 11 , a surgical instrument including amagnetic field sensor 560 in accordance with an embodiment of the present disclosure is generally designated as 500.Surgical instrument 500 is configured to serially deploy at least onesurgical anchor 510 to attach a prosthesis in place in the repair of a defect in tissue such as an inguinal hernia.Surgical instrument 500 includes ahandle assembly 520 and adelivery tube 530 extending distally fromhandle assembly 520.Handle assembly 520 includes astationary handle 521 and afiring trigger 522. Reference may be made to U.S. Pat. No. 7,758,612, the entire contents of which are incorporated herein by reference, for a more detailed discussion of the structure and operation ofsurgical instrument 500 andsurgical anchor 510. - With particular reference now to
FIGS. 10 and 12 ,magnetic field sensor 560 is disposed at a distal portion ofdelivery tube 530. The placement ofmagnetic field sensor 560 at, e.g., a distal-most portion ofdelivery tube 530, facilitates use thereof in conjunction with amagnet assembly 600.Magnet assembly 600 includes amagnet 605 and anelongated support 607 extending frommagnet 605.Magnet 605 andmagnetic field sensor 560 may be constructed as described above in connection with embodiments ofFIGS. 1-9 . -
Magnet 605 may be positioned on one side of tissue to be measured andmagnetic field sensor 560 may be placed on an opposing side of tissue.Magnetic field sensor 560 generates a detectable signal in response to a magnetic field ofmagnet 605.Magnetic field sensor 560 may be connected to a processor (not shown). The processor may calculate the distance betweenmagnet 605 andmagnetic field sensor 560, i.e., thickness of tissue, based on the detectable signal. - With respect to
FIG. 11 , upon determining thickness of tissue, the surgeon may then applysurgical anchor 510 to tissue by pullingtrigger 522 towardstationary handle 521. When the surgeon pullstrigger 522 towardstationary handle 521, alever 524 rotates counterclockwise such that acam surface 531 oflever 524 contacts apiston 525 which drives ananchor carrier rod 526 distally. Atorsion spring 527 is compressed aslever 524 is rotated counterclockwise.Anchor carrier 526 is urged distally within a queuingspring 528, which, in turn, urges thedistal-most anchor 510 past a distal end ofdelivery tube 530. In this manner,anchor 510 penetrates through the prosthesis and tissue. - Although the illustrative embodiments of the present disclosure have been described herein with reference to the accompanying drawings, the above description, disclosure, and figures should not be construed as limiting, but merely as exemplifications of particular embodiments. For example, in the embodiments described in connection with
FIGS. 1 to 5 , it is envisioned that the plurality of magnets 362 a-d may be disposed ontissue contacting surface 324 a ofanvil assembly 324, and the plurality of magnetic field sensors 360 a-d may be disposed ontissue contacting surface 322 a ofcartridge assembly 322. Likewise, with respect to the embodiments described in connection withFIGS. 6 to 9 , it is envisioned that the plurality ofmagnets 162 may be disposed ontissue contacting surface 130 a ofanvil assembly 130, and the plurality ofmagnetic field sensors 160 may be disposed ontissue contacting surface 131 a ofshell assembly 131. In addition, it is envisioned thatmagnet 605 may be placed on a distal portion ofdelivery tube 530, andmagnetic field sensor 560 may be provided as a separate element fromsurgical instrument 500. It is to be understood, therefore, that the disclosure is not limited to those precise embodiments, and that various other changes and modifications may be effected therein by one skilled in the art without departing from the scope or spirit of the disclosure.
Claims (12)
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CN105592807A (en) | 2016-05-18 |
EP3049000A1 (en) | 2016-08-03 |
WO2015047573A1 (en) | 2015-04-02 |
CN110074755A (en) | 2019-08-02 |
EP3049000A4 (en) | 2017-06-21 |
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